import java.util.Map;

public class EnvironmentVariable {
	public static void main(String[] args) {
		Map<String, String> envs = System.getenv();
		if (envs != null) {
			for (Map.Entry<String, String> key2Value : envs.entrySet()) {
				System.out.println(key2Value.getKey() + ": "
						+ key2Value.getValue());
			}
		}
	}
}
